There are no current plans to release a C++ unit testing framework via the Linux tools project.

There used to be cppunit that was part of the CDT. It languished for a while and was later shipped in Fedora's eclipse-cdt but this was stopped as of release 5.0.0 (we are at 6.0.1 at the moment). If cppunit is what you are looking for, you might want to consider opening an RFE against the upstream CDT or Linux tools or if you use the Fedora eclipse-cdt package, against Fedora eclipse-cdt.